Аңдатпа
The energetic characteristics of self and impurity interstitial Al atom migration in unstressed α-Fe and in stress gradients are studied by a computer simulation method. The stress gradient effect displays itself in the fact that the energetic barriers against interstitial migration along the stress gradient are lower than those opposite to it. The migration energy of the Al atom of an FeAl dumbbell is considerably lower than that of the Fe atom in the same dumbbell; it means that Al atom serve as impurity traps for self-interstitials in α-Fe. At large values of the stress gradient the spontaneous migration of the Al atoms from the mixed dumbbells is possible.